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Theofilos Karachalios School of Health Sciences, Faculty of Medicine, University of Thessalia, University General Hospital of Larissa, Mezourlo Region, 41110 Larissa, Greece

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George Komnos Orthopaedic Department, University General Hospital of Larissa, Greece

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Antonios Koutalos Orthopaedic Department, University General Hospital of Larissa, Greece

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Introduction Since its introduction in the 1960s, total hip arthroplasty (THA) has proved to be an excellent and reliable treatment procedure for the end stages of hip pathology, with satisfactory clinical outcomes at 15- to 20-year follow

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James R Satalich VCU Health Department of Orthopaedic Surgery, Richmond, Virginia, USA

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Daniel J Lombardo VCU Health Department of Orthopaedic Surgery, Richmond, Virginia, USA

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Simon Newman Nuffield Orthopaedic Center, University of Oxford, Oxford, UK

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Gregory J Golladay VCU Health Department of Orthopaedic Surgery, Richmond, Virginia, USA

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Nirav K Patel VCU Health Department of Orthopaedic Surgery, Richmond, Virginia, USA

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Background Sir John Charnley’s low friction total hip arthroplasty (THA) revolutionized the management of hip osteoarthritis. His design featured a low frictional torque head, a high-density polyethylene-bearing surface, and fixation of

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Bülent Atilla Hacettepe University Faculty of Medicine, Ankara, Turkey

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Introduction Patients with untreated developmental dysplasia of the hip (DDH) may eventually develop secondary osteoarthritis, beginning in early adulthood. Arthroplasty is the main treatment of choice. In some countries, DDH is the main cause

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Michael M. Morlock TUHH Hamburg University of Technology, Hamburg, Germany.

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Robert Hube OCM Clinic Munich, Munich, Germany

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Georgi Wassilew Department for Orthopaedics and Orthopaedic Surgery, University of Greifswald, Greifswald, Germany

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Felix Prange TUHH Hamburg University of Technology, Hamburg, Germany.

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Gerd Huber TUHH Hamburg University of Technology, Hamburg, Germany.

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Carsten Perka Center for Musculoskeletal Surgery, Orthopedic Department, Charité – Universitätsmedizin Berlin, Berlin, Germany

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literature search (13 July 2020) with the search terms ‘(taper OR trunnion) AND (hip) AND (corrosion)’ yielded 350 relevant hits, demonstrating the continuing interest in this topic. The reported studies describe clinical observations based on explant

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Bart G. Pijls Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

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Jennifer M. T. A. Meessen Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

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Keith Tucker Implant Performance Committee, England and Wales National Joint Registry, ODEP, Beyond Compliance and MHRA Expert Advisory Group for MoM Prostheses, London, UK

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Susanna Stea Istituto Ortopedico Rizzoli, Bologna, Italy

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Liza Steenbergen Dutch Arthroplasty Register (Landelijke Registratie Orthopedische Implantaten, LROI), 's- Hertogenbosch, The Netherlands

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Anne Marie Fenstad The Norwegian Arthroplasty Register, Department of Orthopaedic Surgery, Haukeland University Hospital, Bergen, Norway

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Keijo Mäkelä Department of Orthopedics and Traumatology, Turku University Hospital, Turku, Finland

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Ioan Cristian Stoica Foisor Orthopaedics Clinical Hospital, Bucharest, Romania

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Maxim Goncharov VJRR, Russian Scientific Research Institute of Traumatology and Orthopedics, St Petersburg, Russia

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Søren Overgaard Department of Orthopedic Surgery and Traumatology, Odense University Hospital, Odense, Denmark

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Jorge Arias de la Torre Departament de Salut, Agència de Qualitat i Avaluació Sanitàries de Catalunya (AQuAS), Barcelona, Spain
CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
Instituto de Biomedicina (IBIOMED). Universidad de León, León, Spain

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Anne Lübbeke Division of Orthopaedic Surgery and Traumatology, Geneva University Hospitals, Geneva, Switzerland
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK

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Ola Rolfson Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Rob G. H. H. Nelissen Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

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Introduction Metal-on-metal (MoM) bearings have been used since the early years of total hip replacement (THR). Early historical MoM prostheses from the 1960s, 1970s and 1980s include the McKee Farrar hip and the Ring hip prostheses. 1

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Riccardo D’Ambrosi IRCCS Istituto Ortopedico Galeazzi, Milan, Italy

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Nicola Ursino IRCCS Istituto Ortopedico Galeazzi, Milan, Italy

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Carmelo Messina IRCCS Istituto Ortopedico Galeazzi, Milan, Italy
Dipartimento di Scienze Biomediche per la Salute, Università degli Studi di Milano, Milano, Italy

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Federico Della Rocca Istituto Clinico Humanitas, Rozzano, Italy

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Michael Tobias Hirschmann Department of Orthopaedic Surgery and Traumatology Kantonsspital Baselland (Bruderholz, Liestal, Laufen) Switzerland

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Introduction The capsule of the hip joint is a cylindrical-shaped arrangement of dense fibres connecting the acetabulum and femur through firm proximal attachments to the acetabular periosteum and distal attachments to the inter

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Maurizio De Pellegrin Pediatric Orthopedic Unit, San Raffaele Hospital, Milan, Italy

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Lucrezia Montanari Pediatric Orthopedic Unit, San Raffaele Hospital, Milan, Italy

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Desiree Moharamzadeh Pediatric Orthopedic Unit, San Raffaele Hospital, Milan, Italy

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Oliver Eberhardt Klinikum Stuttgart Olgahospital und Frauenklinik Stuttgart, Orthopädische Klinik, Stuttgart, Germany

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congruity. 1 The labrum has been considered as an obstacle to reduction in unstable and dysplastic hips. Severin in 1950, reported that it was unnecessary to excise the limbus if the arthrographic follow-up demonstrated a remodelling of the inverted

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Rory Cuthbert The Royal London Hospital, London, UK

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James Wong Barking, Havering and Redbridge University Hospitals, Romford, UK

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Philip Mitchell South West London Elective Orthopaedic Centre, Epsom, UK

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Parag Kumar Jaiswal Royal Free London NHS Foundation Trust, London, UK

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Introduction Total hip arthroplasty (THA) is one of the most successful surgical procedures – reducing pain and providing functional improvement to enhance patients’ quality of life. As healthcare continues to evolve and life expectancy rises

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Christiaan P. van Lingen Isala Clinics, Department of Orthopaedic Surgery and Traumatology, Zwolle, The Netherlands

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Luigi M. Zagra IRCCS Istituto Ortopedico Galeazzi, Milan, Italy

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Harmen B. Ettema Isala Clinics, Department of Orthopaedic Surgery and Traumatology, Zwolle, The Netherlands

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Cees C. Verheyen Isala Clinics, Department of Orthopaedic Surgery and Traumatology, Zwolle, The Netherlands

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Introduction Large-head metal-on-metal (MoM) bearings were re-popularised in the late 1990s with the introduction of modern hip resurfacing (HR), followed shortly afterward by large metal head total hip arthroplasty (THA). The introduction of

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Dongmei Wu School of Medicine, University of St. Andrews, St. Andrews, Fife, United Kingdom

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Rohan M Bhalekar ExplantLab, The Biosphere, Newcastle Helix, Newcastle-upon-Tyne, United Kingdom

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Jordan S Marsh School of Medicine, University of St. Andrews, St. Andrews, Fife, United Kingdom

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David J Langton ExplantLab, The Biosphere, Newcastle Helix, Newcastle-upon-Tyne, United Kingdom

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Alan J Stewart School of Medicine, University of St. Andrews, St. Andrews, Fife, United Kingdom

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Introduction Bearing partners for artificial joint implants are usually composed of ceramic, high-quality plastic or durable metal and are used to replace the damaged joint(s) (i.e. hip, knee, shoulder, ankle and elbow joints). Among a variety

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